1,720,966 research outputs found
SYNTHESIS, CHARACTERIZATION AND APPLICATION OF GREEN SYNTHESIZED Ag NPs IN ENDODONTIC THERAPY TO REDUCE MICROBIAL BIOFILM
Full text linkIntroduction: Green synthesis of Silver Nanoparticles (Ag NPs) by aqueous extract of Nophapodytes foetida plant offers biocompatible and cost-efficient substitute for costly and non-biocompatible chemical reducing agents.
Methods: The crude aqueous extract of Nophapodytes foetida plant bark was used with silver nitrate in the volume ratio of 1:2 for synthesis of Ag NPs. The mixture was incubated at 40 °C for 1 hr results into synthesis of Ag NPs, which was further confirmed by characterization. The characterization of Ag NPs was carried out by UV-Vis Spectroscopy, Scanning Tunneling Microscopy (STM) and Scanning Electron Microscopy (SEM) to study optical and morphological characteristics, respectively. Studies were also performed for determination antibacterial activity of Ag NPs against inoculum of Enterococcus faecalis (ATCC: 29212) containing 1⨯105 CFU/ mL by anti-well diffusion assay and broth dilution method.
Results: The absorption spectrum of Ag NPs and band gap was found to be at 355 nm and 3.49 eV respectively. Ag NPs showed cluster morphology on surface at 47.2 nm under STM and rough nuggets like morphology of Ag NPs with average size range of 25 to 55 nm under SEM.
Conclusion: Ag NPs was found to be effective antibacterial agent at the concentration of 1000 µg/mL against Enterococcus faecalis predominantly present in the root canal and therefore the Ag NPs based intracanal medicaments may have applications in endodontics
BIOGENIC ZnO NPs BASED INTRACANAL MEDICAMENT AGAINST Enterococcus faecalis
Full text linkAim: This study aimed to investigate the antibacterial efficacy of biogenic ZnO nanoparticles based intracanal medicament.
Methodology:
The biogenic ZnONP based irrigant solution was tested in vitro on Enterococcus faecalis (ATCC: 29212) with Sodium hypochlorite as positive control. The synthesis of ZnO NPs was carried out by green synthesis method using 0.1 M Zinc sulphate aqueous extract of Nophapodytes foetida plant. The biosynthesis of nanoparticles was confirmed by UV-Vis spectroscopy and characterized by XRD, and Scanning Electron Microscopy. The qualitative and quantitative antimicrobial activity of ZnO NPs was tested against gram positive Enterococcus faecalis bacteria.
Results: The optical, structural and morphological analysis reveals the formation of ZnO nanostructures having flakes like morphology with size ranges from 20 to 35 nm. The inhibition zones was observed in all concentrations with positive control. The number of colony forming units dropped to zero at 500µg/mL suspension of ZnO NPs.
Conclusion: Biogenic ZnO NPs can be used as an effective endodontic irrigant after checking its feasibility
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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